third_party/WebKit/Source/modules/serviceworkers/ServiceWorker.cpp

/*
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#include "modules/serviceworkers/ServiceWorker.h"

#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/MessagePort.h"
#include "core/events/Event.h"
#include "modules/EventTargetModules.h"
#include "modules/serviceworkers/ServiceWorkerContainerClient.h"
#include "public/platform/WebMessagePortChannel.h"
#include "public/platform/WebSecurityOrigin.h"
#include "public/platform/WebString.h"
#include "public/platform/modules/serviceworker/WebServiceWorkerState.h"
#include <memory>

namespace blink {

const AtomicString& ServiceWorker::interfaceName() const {
  return EventTargetNames::ServiceWorker;
}

void ServiceWorker::postMessage(ExecutionContext* context,
                                PassRefPtr<SerializedScriptValue> message,
                                const MessagePortArray& ports,
                                ExceptionState& exceptionState) {
  ServiceWorkerContainerClient* client =
      ServiceWorkerContainerClient::from(getExecutionContext());
  if (!client || !client->provider()) {
    exceptionState.throwDOMException(
        InvalidStateError,
        "Failed to post a message: No associated provider is available.");
    return;
  }

  // Disentangle the port in preparation for sending it to the remote context.
  std::unique_ptr<MessagePortChannelArray> channels =
      MessagePort::disentanglePorts(context, ports, exceptionState);
  if (exceptionState.hadException())
    return;
  if (m_handle->serviceWorker()->state() == WebServiceWorkerStateRedundant) {
    exceptionState.throwDOMException(InvalidStateError,
                                     "ServiceWorker is in redundant state.");
    return;
  }

  WebString messageString = message->toWireString();
  std::unique_ptr<WebMessagePortChannelArray> webChannels =
      MessagePort::toWebMessagePortChannelArray(std::move(channels));
  m_handle->serviceWorker()->postMessage(
      client->provider(), messageString,
      WebSecurityOrigin(getExecutionContext()->getSecurityOrigin()),
      webChannels.release());
}

void ServiceWorker::internalsTerminate() {
  m_handle->serviceWorker()->terminate();
}

void ServiceWorker::dispatchStateChangeEvent() {
  this->dispatchEvent(Event::create(EventTypeNames::statechange));
}

String ServiceWorker::scriptURL() const {
  return m_handle->serviceWorker()->url().string();
}

String ServiceWorker::state() const {
  switch (m_handle->serviceWorker()->state()) {
    case WebServiceWorkerStateUnknown:
      // The web platform should never see this internal state
      ASSERT_NOT_REACHED();
      return "unknown";
    case WebServiceWorkerStateInstalling:
      return "installing";
    case WebServiceWorkerStateInstalled:
      return "installed";
    case WebServiceWorkerStateActivating:
      return "activating";
    case WebServiceWorkerStateActivated:
      return "activated";
    case WebServiceWorkerStateRedundant:
      return "redundant";
    default:
      ASSERT_NOT_REACHED();
      return nullAtom;
  }
}

ServiceWorker* ServiceWorker::from(
    ExecutionContext* executionContext,
    std::unique_ptr<WebServiceWorker::Handle> handle) {
  return getOrCreate(executionContext, std::move(handle));
}

bool ServiceWorker::hasPendingActivity() const {
  if (m_wasStopped)
    return false;
  return m_handle->serviceWorker()->state() != WebServiceWorkerStateRedundant;
}

void ServiceWorker::contextDestroyed(ExecutionContext*) {
  m_wasStopped = true;
}

ServiceWorker* ServiceWorker::getOrCreate(
    ExecutionContext* executionContext,
    std::unique_ptr<WebServiceWorker::Handle> handle) {
  if (!handle)
    return nullptr;

  ServiceWorker* existingWorker =
      static_cast<ServiceWorker*>(handle->serviceWorker()->proxy());
  if (existingWorker) {
    ASSERT(existingWorker->getExecutionContext() == executionContext);
    return existingWorker;
  }

  return new ServiceWorker(executionContext, std::move(handle));
}

ServiceWorker::ServiceWorker(ExecutionContext* executionContext,
                             std::unique_ptr<WebServiceWorker::Handle> handle)
    : AbstractWorker(executionContext),
      m_handle(std::move(handle)),
      m_wasStopped(false) {
  ASSERT(m_handle);
  m_handle->serviceWorker()->setProxy(this);
}

ServiceWorker::~ServiceWorker() {}

DEFINE_TRACE(ServiceWorker) {
  AbstractWorker::trace(visitor);
}

}  // namespace blink